FFmpeg: libavutil/timecode.c File Reference

See SMPTE ST 314M-2005 Sec 4.4.2.2.1 "Time code pack (TC)" the format description as follows: bits 0-5: hours, in BCD(6bits) bits 6: BGF1 bits 7: BGF2 (NTSC) or FIELD (PAL) bits 8-14: minutes, in BCD(7bits) bits 15: BGF0 (NTSC) or BGF2 (PAL) bits 16-22: seconds, in BCD(7bits) bits 23: FIELD (NTSC) or BGF0 (PAL) bits 24-29: frames, in BCD(6bits) bits 30: drop frame flag (0: non drop, 1: drop) bits 31: color frame flag (0: unsync mode, 1: sync mode)

Note: BCD numbers (6 or 7 bits): 4 or 5 lower bits for units, 2 higher bits for tens.; Frame number adjustment is automatically done in case of drop timecode, you do NOT have to call av_timecode_adjust_ntsc_framenum2().; The frame number is relative to tc->start.; Color frame (CF) and binary group flags (BGF) bits are set to zero.

Definition at line 53 of file timecode.c.

Referenced by dv_write_pack(), mxf_write_system_item(), and decklink_input_callback::VideoInputFrameArrived().

◆ av_timecode_get_smpte()

uint32_t av_timecode_get_smpte ( AVRational rate,

int drop,

int hh,

int mm,

int ss,

int ff

)

Convert sei info to SMPTE 12M binary representation.

Parameters: rate frame rate in rational form

drop drop flag

hh hour

mm minute

ss second

ff frame number

Returns: the SMPTE binary representation

Definition at line 69 of file timecode.c.

Referenced by av_timecode_get_smpte_from_framenum(), h264_export_frame_props(), and set_side_data().

◆ av_timecode_make_string()

char* av_timecode_make_string ( const AVTimecode * tc,

char * buf,

int framenum

)

Load timecode string in buf.

Parameters: buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long

tc timecode data correctly initialized

framenum frame number

Returns: the buf parameter

Note: Timecode representation can be a negative timecode and have more than 24 hours, but will only be honored if the flags are correctly set.; The frame number is relative to tc->start.

Definition at line 103 of file timecode.c.

Referenced by draw_text(), imf_read_header(), mxf_add_timecode_metadata(), parse_timecode_in_framenum_format(), segment_end(), test_cpl_parsing(), and decklink_input_callback::VideoInputFrameArrived().

◆ bcd2uint()

static unsigned bcd2uint ( uint8_t bcd )

static

Definition at line 129 of file timecode.c.

Referenced by av_timecode_make_smpte_tc_string2().

◆ av_timecode_make_smpte_tc_string2()

char* av_timecode_make_smpte_tc_string2 ( char * buf,

AVRational rate,

uint32_t tcsmpte,

int prevent_df,

int skip_field

)

Get the timecode string from the SMPTE timecode format.

In contrast to av_timecode_make_smpte_tc_string this function supports 50/60 fps timecodes by using the field bit.

Parameters: buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long

rate frame rate of the timecode

tcsmpte the 32-bit SMPTE timecode

prevent_df prevent the use of a drop flag when it is known the DF bit is arbitrary

skip_field prevent the use of a field flag when it is known the field bit is arbitrary (e.g. because it is used as PC flag)

Returns: the buf parameter

Definition at line 138 of file timecode.c.

Referenced by av_timecode_make_smpte_tc_string(), decode_frame(), dump_s12m_timecode(), h264_export_frame_props(), set_side_data(), show_frame(), and wsd_read_header().

◆ av_timecode_make_smpte_tc_string()

char* av_timecode_make_smpte_tc_string ( char * buf,

uint32_t tcsmpte,

int prevent_df

)

Get the timecode string from the SMPTE timecode format.

Parameters: buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long

tcsmpte the 32-bit SMPTE timecode

prevent_df prevent the use of a drop flag when it is known the DF bit is arbitrary

Returns: the buf parameter

Definition at line 162 of file timecode.c.

◆ av_timecode_make_mpeg_tc_string()

char* av_timecode_make_mpeg_tc_string ( char * buf,

uint32_t tc25bit

)

Get the timecode string from the 25-bit timecode format (MPEG GOP format).

Parameters: buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long

tc25bit the 25-bits timecode

Returns: the buf parameter

Definition at line 167 of file timecode.c.

Referenced by filter_frame(), mpeg_decode_frame(), mpeg_decode_gop(), and show_frame().

◆ check_fps()

static int check_fps ( int fps )

static

Definition at line 179 of file timecode.c.

Referenced by av_timecode_check_frame_rate(), and check_timecode().

◆ check_timecode()

static int check_timecode ( void * log_ctx,

AVTimecode * tc

)

static

Definition at line 192 of file timecode.c.

Referenced by av_timecode_init(), and av_timecode_init_from_components().

◆ fps_from_frame_rate()

static int fps_from_frame_rate ( AVRational rate )

static

Definition at line 209 of file timecode.c.

Referenced by av_timecode_check_frame_rate(), av_timecode_init(), and av_timecode_init_from_components().

◆ av_timecode_check_frame_rate()

int av_timecode_check_frame_rate ( AVRational rate )

Check if the timecode feature is available for the given frame rate.

Returns: 0 if supported, <0 otherwise

Definition at line 216 of file timecode.c.

◆ av_timecode_init()

int av_timecode_init ( AVTimecode * tc,

AVRational rate,

int flags,

int frame_start,

void * log_ctx

)

Init a timecode struct with the passed parameters.

Parameters: log_ctx a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log)

tc pointer to an allocated AVTimecode

rate frame rate in rational form

flags miscellaneous flags such as drop frame, +24 hours, ... (see AVTimecodeFlag)

frame_start the first frame number

Returns: 0 on success, AVERROR otherwise

Definition at line 221 of file timecode.c.

Referenced by dv_write_header(), mxf_init_timecode(), mxf_parse_physical_source_package(), mxf_parse_structural_metadata(), and parse_timecode_in_framenum_format().

◆ av_timecode_init_from_components()

int av_timecode_init_from_components ( AVTimecode * tc,

AVRational rate,

int flags,

int hh,

int mm,

int ss,

int ff,

void * log_ctx

)

Init a timecode struct from the passed timecode components.

Parameters: log_ctx a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log)

tc pointer to an allocated AVTimecode

rate frame rate in rational form

flags miscellaneous flags such as drop frame, +24 hours, ... (see AVTimecodeFlag)

hh hours

mm minutes

ss seconds

ff frames

Returns: 0 on success, AVERROR otherwise

Definition at line 231 of file timecode.c.

Referenced by av_timecode_init_from_string(), fill_timecode(), and get_bmd_timecode().

◆ av_timecode_init_from_string()

int av_timecode_init_from_string ( AVTimecode * tc,

AVRational rate,

const char * str,

void * log_ctx

)

Parse timecode representation (hh:mm:ss[:;.

]ff).

Parameters: log_ctx a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log).

tc pointer to an allocated AVTimecode

rate frame rate in rational form

str timecode string which will determine the frame start

Returns: 0 on success, AVERROR otherwise

Definition at line 252 of file timecode.c.

Referenced by dv_write_header(), init(), mov_check_timecode_track(), mxf_init_timecode(), and segment_end().

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